// SPDX-License-Identifier: GPL-2.0-or-later /* SCTP kernel implementation * (C) Copyright IBM Corp. 2001, 2004 * * This file is part of the SCTP kernel implementation * * Support for memory object debugging. This allows one to monitor the * object allocations/deallocations for types instrumented for this * via the proc fs. * * Please send any bug reports or fixes you make to the * email address(es): * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * Jon Grimm <jgrimm@us.ibm.com> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <net/sctp/sctp.h> /* * Global counters to count raw object allocation counts. * To add new counters, choose a unique suffix for the variable * name as the helper macros key off this suffix to make * life easier for the programmer. */ SCTP_DBG_OBJCNT(sock); SCTP_DBG_OBJCNT(ep); SCTP_DBG_OBJCNT(transport); SCTP_DBG_OBJCNT(assoc); SCTP_DBG_OBJCNT(bind_addr); SCTP_DBG_OBJCNT(bind_bucket); SCTP_DBG_OBJCNT(chunk); SCTP_DBG_OBJCNT(addr); SCTP_DBG_OBJCNT(datamsg); SCTP_DBG_OBJCNT(keys); /* An array to make it easy to pretty print the debug information * to the proc fs. */ static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = { SCTP_DBG_OBJCNT_ENTRY(sock), SCTP_DBG_OBJCNT_ENTRY(ep), SCTP_DBG_OBJCNT_ENTRY(assoc), SCTP_DBG_OBJCNT_ENTRY(transport), SCTP_DBG_OBJCNT_ENTRY(chunk), SCTP_DBG_OBJCNT_ENTRY(bind_addr), SCTP_DBG_OBJCNT_ENTRY(bind_bucket), SCTP_DBG_OBJCNT_ENTRY(addr), SCTP_DBG_OBJCNT_ENTRY(datamsg), SCTP_DBG_OBJCNT_ENTRY(keys), }; /* Callback from procfs to read out objcount information. * Walk through the entries in the sctp_dbg_objcnt array, dumping * the raw object counts for each monitored type. */ static int sctp_objcnt_seq_show(struct seq_file *seq, void *v) { int i; i = (int)*(loff_t *)v; seq_setwidth(seq, 127); seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label, atomic_read(sctp_dbg_objcnt[i].counter)); seq_pad(seq, '\n'); return 0; } static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos) { return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos; } static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v) { } static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos) { ++*pos; return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos; } static const struct seq_operations sctp_objcnt_seq_ops = { .start = sctp_objcnt_seq_start, .next = sctp_objcnt_seq_next, .stop = sctp_objcnt_seq_stop, .show = sctp_objcnt_seq_show, }; /* Initialize the objcount in the proc filesystem. */ void sctp_dbg_objcnt_init(struct net *net) { struct proc_dir_entry *ent; ent = proc_create_seq("sctp_dbg_objcnt", 0, net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops); if (!ent) pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n"); }